51218949 has 8 divisors (see below), whose sum is σ = 68324992. Its totient is φ = 34129440.

The previous prime is 51218941. The next prime is 51218969. The reversal of 51218949 is 94981215.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51218949 - 2³ = 51218941 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51218941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10257 + ... + 14409.

It is an arithmetic number, because the mean of its divisors is an integer number (8540624).

Almost surely, 2^51218949 is an apocalyptic number.

It is an amenable number.

51218949 is a deficient number, since it is larger than the sum of its proper divisors (17106043).

51218949 is a wasteful number, since it uses less digits than its factorization.

51218949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8267.

The product of its digits is 25920, while the sum is 39.

The square root of 51218949 is about 7156.7415071386. The cubic root of 51218949 is about 371.3729101362.

The spelling of 51218949 in words is "fifty-one million, two hundred eighteen thousand, nine hundred forty-nine".